R 325.10109 Definitions; T to Y.

Rule 109. As used in these rules: (a) "Test well" means a well that is drilled on a site that has not been approved for use as a production well in accordance with the provisions of part 8 of these rules. (b) "Too numerous to count" means that the total number of bacterial colonies is more than 200 on a 47 millimeter diameter membrane filter. (c) "Total organic carbon" or "TOC" means total organic carbon in mg/l measured using heat, oxygen, ultraviolet irradiation, chemical oxidants, or combinations of these oxidants that convert organic carbon to carbon dioxide, rounded to 2 significant figures. (d) "Total trihalomethanes" or "TTHM" means the sum of the concentration, in milligrams per liter, rounded to 2 significant figures, of all of the following: (i) The trihalomethane compounds. (ii) Trichloromethane (chloroform). (iii) Dibromochloromethane. (iv) Bromodichloromethane. (v) Tribromomethane (bromoform). (e) "Transient noncommunity water supply" or "transient noncommunity water system" means a noncommunity supply that does not meet the definition of nontransient noncommunity water supply in R 325.10106(h). (f) "Treatment system" means a facility or structure and associated appurtenances installed for the purpose of treating drinking water before delivery to a distribution system. (g) "Treatment technique" means a minimum treatment requirement or a necessary methodology or technology that is employed by a public water supply for the control of the chemical, physical, biological, or radiological characteristics of the public water supply. (h) "Trihalomethane" or "THM" means 1 of the family of organic compounds named as derivatives of methane, wherein 3 of the 4 hydrogen atoms in methane are each substituted by a halogen atom in the molecular structure. (i) "Two-stage lime softening" means a process in which chemical addition and hardness precipitation occur in each of 2 distinct unit clarification processes in series prior to filtration. (j) "Unregulated contaminants" means a group of contaminants for which state drinking water standards have not been promulgated, but for which monitoring requirements apply. (k) "Variance" means an order, with appropriate conditions and compliance schedules and requirements, which is issued by the director to a public water supply and which permits a public water supply to be in noncompliance with a state drinking water standard, including a specified treatment technique. (l) "VOC" means volatile organic chemical. (m) "Water hauler" means a person engaged in bulk vehicular transportation of water to other than the water hauler's own household which is intended for use or used for drinking or household purposes. Excluded from this definition are those persons providing water solely for employee use. (n) "Water transportation tank" means a tank that is associated with an over the road vehicle that is used for the bulk transport of drinking water. (o) "Waterworks system" or "system" means a system of pipes and structures through which water is obtained and distributed, including, but not limited to all of the following which are actually used or intended for use for the purpose of furnishing water for drinking or household purposes: (i) Wells and well structures, intakes, and cribs. (ii) Pumping stations. (iii) Treatment plants. (iv) Storage tanks. (v) Pipelines and appurtenances. (vi) A combination of the items specified in this subdivision. (p) "Wholesale system" or "wholesale supply" means a public water supply that treats source water as necessary to produce finished water and then delivers some or all of that finished water to another public water supply. Delivery may be through a direct connection or through the distribution system of 1 or more consecutive supplies. (q) "Year-round service" means the ability of a supplier of water to provide drinking water on a continuous basis to a living unit or facility.